105721061 has 8 divisors (see below), whose sum is σ = 108545184. Its totient is φ = 102927760.

The previous prime is 105721051. The next prime is 105721103. The reversal of 105721061 is 160127501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105721061 is a prime.

It is a super-2 number, since 2×105721061² = 22353885477931442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105721051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 671 + ... + 14556.

It is an arithmetic number, because the mean of its divisors is an integer number (13568148).

Almost surely, 2^105721061 is an apocalyptic number.

It is an amenable number.

105721061 is a deficient number, since it is larger than the sum of its proper divisors (2824123).

105721061 is a wasteful number, since it uses less digits than its factorization.

105721061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15411.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 105721061 is about 10282.0747419964. The cubic root of 105721061 is about 472.8468544877.

Adding to 105721061 its reverse (160127501), we get a palindrome (265848562).

The spelling of 105721061 in words is "one hundred five million, seven hundred twenty-one thousand, sixty-one".